hygger Aquarium Filter, Ultra Quiet Aquarium Hang on Filter, Multi-Stage Filtration Activated Carbon Biochemical Fish Tank Filter for up to 21 Gallon Aquariums, Adjustable Flow, 79 GPH, 5W, Black

Additional Details from the Manufacturer

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• 【Multi-Stage Filtration & Oxygenate】This aquarium filter is equipped with ultrafine cotton, activated carbon cotton and bio balls. Provides mechanical, chemical and biological filtration for a clean and healthy aquatic environment. In addition, the vent on the top of the filter and the aeration tank at the water outlet ensure that the water returned to the tank is fully oxygenated and adds oxygen to the fish tank
• 【Innovative Cleaning Power】The pump pushes the water up into the bio balls basket on the top of the filter, from the bottom of the basket into the fine cotton and activated carbon cotton slots, and finally out from the top. The innovative bottom-up-bottom-up flow ensures water contact with all filter media, providing the best filtration effect. Extra large filter chamber, you can also add filter media freely
• 【Quiet Operation】The unique overflow design of the aquarium filter reduces splash and makes the return flow exceptionally quiet without unduly disturbing the fauna, perfect for shrimp or betta fish. The bottom pump helps dampen noise and create a quiet environment for your lovely fish
• 【Fast Start & Adjustable Flow】Ready to use right out of the box. The filter starts up immediately when plugged in, without the need to add water. It will also restart automatically if the power is interrupted and restored. The adjustable flow knob allows you to increase or decrease the water flow at will, which is very useful when feeding
• 【Hanging on filter】Available in 79 GPH, 153 GPH sizes. The 79 GPH filter measures 5.5” X 3.5” X 2.6”, suitable for 4-21 gallon aquariums; The 153 GPH filter measures 6.9” X 3.7” X 8.7”, suitable for 20-50 gallon aquariums. Included components: fish tank filter body, air inlet pipe, extension pipe, air inlet sponge, ultra-fine cotton, activated carbon cotton, bio-ball. Warranty: 1-year.